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Zircon U-Pb geochronology, Sr-Nd-Hf isotopic composition and geological significance of the Late Triassic Baijiazhuang and Lvjing granitic plutons in West Qinling Orogen
Duan, Meng1; Niu, Yaoling1,2,3; Kong, Juanjuan2; Sun, Pu2; Hu, Yan2; Zhang, Yu4; Chen, Shuo2; Li, Jiyong2
2016-09-01
发表期刊LITHOS
卷号260页码:443-456
文章类型Article
摘要The Qinling Orogen was a consequence of continental collision of the South China Craton with the North China Craton in the Triassic and caused widespread granitoid magmatism. However, the petrogenesis of these granitoids remains controversial. In this paper, we choose the Baijiazhuang (BJZ) and Lvjing (LJ) plutons in the West Qinling Orogen for a combined study of the zircon U-Pb geochronology, whole-rock major and trace element compositions and Sr-Nd-Hf isotopic characteristics. We obtained zircon crystallization ages of similar to 216 Ma and similar to 212 Ma for the BJZ and the LJ plutons, respectively. The granitoid samples from both plutons have high K2O metaluminous to peraluminous compositions. They are enriched in large ion lithophile elements (LILEs), light rare earth elements (LREEs) and depleted in high field-strength elements (HFSEs) with significant negative Eu anomalies. The BJZ samples have initial Sr isotopic ratios of 0.7032 to 0.7078, epsilon(Nd)(t) of -10.99 to -8.54 and epsilon(Hf)(t) of -1022 to -6.41. The LJ granitoids have initial Sr isotopic ratios of 0.7070 to 0.7080, epsilon(Nd)(t) of -5.37 to -4.58 and epsilon(Hf)(t) of -3.64 to -1.78. The enriched isotopic characteristics of the two plutons are consistent with their source being dominated by ancient continental crust. However, two BJZ samples show depleted Sr isotope compositions, which may infer possible involvement of mantle materials. Mantle-derived melt, which formed from partial melting of mantle wedge peridotite facilitated by dehydration of the subducted/subducting Mianlue ocean crust, provide the required heat for the crustal melting while also contributing to the compositions of these granitoids. That is, the two granitic plutons are magmatic responses to the closure of the Mianlue ocean basin and the continental collision between the Yangtze and South Qinling crustal terranes. (C) 2016 Elsevier B.V. All rights reserved.
关键词West Qinling Orogen Late Triassic Granitoid Plutons Lower Crust Melting Slab Break-off Mantle Wedge Melting
DOI10.1016/j.lithos.2016.04.015
收录类别SCI
语种英语
WOS记录号WOS:000381529800032
引用统计
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/135878
专题海洋地质与环境重点实验室
作者单位1.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
3.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
4.Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China
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Duan, Meng,Niu, Yaoling,Kong, Juanjuan,et al. Zircon U-Pb geochronology, Sr-Nd-Hf isotopic composition and geological significance of the Late Triassic Baijiazhuang and Lvjing granitic plutons in West Qinling Orogen[J]. LITHOS,2016,260:443-456.
APA Duan, Meng.,Niu, Yaoling.,Kong, Juanjuan.,Sun, Pu.,Hu, Yan.,...&Li, Jiyong.(2016).Zircon U-Pb geochronology, Sr-Nd-Hf isotopic composition and geological significance of the Late Triassic Baijiazhuang and Lvjing granitic plutons in West Qinling Orogen.LITHOS,260,443-456.
MLA Duan, Meng,et al."Zircon U-Pb geochronology, Sr-Nd-Hf isotopic composition and geological significance of the Late Triassic Baijiazhuang and Lvjing granitic plutons in West Qinling Orogen".LITHOS 260(2016):443-456.
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